Hypodermic needle



Jan. g

E. C. CROWTHER HYPODERMIC NEEDLE Filed Jan. 27, 1921 Patented Jan. 12, 1926.

UNITED STATES PATENT OFFICE.

EDMOND C. GROWTHER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 DE SANNO 8v HOSKINS, INCQ A CORPORATION OF PENNSYLVANIA.

HYPODERIVIIC NEEDLE.

Application filed January 27, 1921. Serial No. 440,316.

T 0 all whom it may concern:

Be it known that I, EDMOND C. Cnow- 'rirnn, a citizen of the United States, and resident of Philadelphia, county of Philadelphia, State of Pennsylvania, have 'invented an Improvement in Hypodermic Needles, of which the following is a specification.

The object of my invention is to provide a construction of hypodermic needle, for use in connection with a syringe, which shall provide resistance to bending more particularly adjacent to the union of the needle proper with the cap in which it is secured and by which it is detachably applied to a syringe proper.

Hypodermic needles being formed of very finely drawn metal tubing, while providing suflicient resiliency to avoid bending in normal use at a distance from the point of connection with the cap, are liable to bend abruptly immediately at the end of the cap, and thus interfere with the freedom of the passage through the needle and otherwise to impart a defective condition which is undesirable. The danger of bending is particularly liable where the tubular needle is formed of platinum or some ductile alloys, and as such needles are costly, it is important that provision be made to prevent them becoming injured by being abruptly bent.

My invention consists in providing the tubular body of the needle at the end which fits into the ca) with an outer sleeve which is preferably formed of a fine wire closely coiled about the tubular needle body and attached thereto by solder sweated in to form a tight joint between the tight union between the n'eedle and sleeve, and, moreover, my invention includes union between the sleeve and the cap by means of a soldered union, and with the sleeve structure extending well beyond the end of the cap, all of which is more fully set out hereinafter and defined in the claims.

My invention will be better understood by reference to the drawings, in which: Fig. 1 is a side view of a hypodermic needle with the cap thereof in section, and embodying my invention; Fig. 2 is a cross sectional view on line 22 of Fig. 1, taken on larger scale; Fig. 3 is a sectional view correspond ing to a p rtion o F g- .1, but 9.11 a larger scale; and Fig. 4 is a side view of a modified form of my invention.

3 is the cap which is provided with a screw threaded end to screw tightly upon the nipple of the syringe and at the other end with a tubular aperture 7. 4k is the hypodermic needle which is ordinarily formed as a tube and beveled at the end to provide a sharp point. This needle may be straight or bent, as preferred, both forms being common in practice. The needle extends into the tubular aperture 7 in the cap and is secured therein so as to be firmly carried thereby. 5 is the reinforcing or strengthening sleeve which is secured about the end of the needle adjacent to the cap 3. As shown, this sleeve preferably consists of a coil of fine wire tightly wrapped about the butt end of the needle and also partly extends within the aperture 7 of the cap 8 and is soldered thereto as well as being soldered to the needle, as indicated respectively at 9 and 8 in Fig. 3. I prefer that the reinforcing sleeve shall have the solder connection with the needle throughout the whole length of the sleeve, though this is not es sential. The coil structure of the sleeve provides a ridge like helical space between the coil and the wall of the needle into which the solder flows, as will be understood from Fig. 3, and this gives a great strength while at the same time having some flexibility in that the solder is ductile, and the structure of the coil itself permits reasonable flexibility. In that part where the coil extends into the aperture 7 of the cap, a similar helical space is provided and this, when filled with the solder, makes a very firm and tight union between the cap and the sleeve and likewise indirectly with the needle itself. The end of the coil extends well beyond the end of the cap 3, as shown in Fig. 1, and the extreme end may be finished as at 6, so as to prevent any sharp abrupt corners.

While I prefer the reinforcing sleeve to be formed by a coil tightly wrapped about the butt end of the needle, I do not restrict myself thereto as the sleeve may be formed of a tube 5 shown in Fig. 4, which may be soldered to the needle and also soldered or otherwise fastened within the cap 3.

Instead of soldering the needle into the p or atta h ng t thereto, it m y be se cured in place in any other manner which is found satisfactory and I, therefore, do not limit myself to soldering the needle in place.

It will now be apparent that I have devised a novel and useful construction vWhich embodies the features of advantage enumerated as desirable, and while I have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that I .do'not restrict wmyselfxto the details,

bined with a cap for attachment to a syringe and to which cap the needle is firmly secured, and a surrounding sleeve for reinforcing that portion'of theneedle which is 'adjacent'to the cap, said sleeve formed of a helical coil of wire the coils of which closely abut and tightly fit upon the needle throughout the length of said coil and having one end secured to the cap by being soldered or brazed thereto and in rigid relation with respect to the needle adjacent to its attachment in the cap and the other end of said coil extending outwardly from the cap and providing.aiflexible support to'the needle along thelength thereof adjacent to the cap.

2. The invention according to claim 1, wherein further, the soldered or brazed joint between the coil and the cap extends to the joint between the needleandthe end of the coil within the cap, whereby thecoil is rigidly united both to the cap and tothe needle.

3. A hypodermic needle and support, consisting of a cap for. attachment to a syringe, combined with a needle-having its blunt endrigidly secured to the cap, and afiex- 'ible sleeve fitting in close contact with-the needle for approximately one-half its length, said sleeve having 'one'end fitting intoand soldered to thecap and also sol dered' to the needle.

unto set my hand.

EDMOND c. GROWBHER. 

